A state senator who on Sunday helped rescue a woman and her grandson following an armed home invasion robbery in Concord said today the crime was “unacceptable.”

Sen. Mark DeSaulnier was reading in his backyard at his home off Pine Hollow Rd. when, at about 3:15 p.m., he heard a boy pounding on his door.

The boy and his grandmother had been tied up at the house next door to DeSaulnier’s with duct tape and robbed at gunpoint before the three suspects fled the scene.

DeSaulnier called 911 and went next door, where the grandmother lives, to wait with her and the boy, he said.

The boy had managed to free himself and his grandmother before running to DeSaulnier’s house for help.

“The boy was very upset,” DeSaulnier said. “They had been bound up and duct taped. (The boy) just got loose and was courageous enough to run out of the front door.”

DeSaulnier said the boy and his grandmother weren’t sure if the suspects were still in the house when they escaped, but when Concord police showed up in force just a few minutes later, they determined the suspects were no longer in the home.

The boy and his grandmother were shaken up, though were not seriously injured.

DeSaulnier said this kind of crime was “very unusual” for the neighborhood, but that no one should have to suffer through a home invasion robbery no matter where they live.

“I have to say it’s just unacceptable that this happens anywhere,” he said. “A grandmother should be able to sit in her home with her grandchild and not have to worry about three armed men coming to the door with guns and taping them up.”